Water-soluble cationic azo-dyestuffs



United States Patent WATER-SOLUBLE CATEGNEC AZG-DYESTUFFS Otto Fuchs, Frankfurt am Main, and Friedrich Ische,

Kelkheim, Taunus, Germany, assignors to Farbwerire Hoechst Aktiengesellschaft vormals Meister Lucius & Bruning, Frankfurt am Main, Germany, a corporation of Germany No Drawing. Filed Apr. 1, 1963, Ser. No. 269,792 Claims priority, application Germany, Apr. 5, 1962,

'7 Claims. (Cl. 260-452) The present invention relates to Water-soluble cationic azo-dyestuffs and to a process for preparing them.

We have found that water-soluble cationic azo-dyestuffs of the general Formula 1 in which K represents the radical of a coupling component of the benzene or naphthalene series which besides X may contain further substituents, X represents a hydroxy or amino group being in ortho or para position to the grouping in which K and X are defined as above and the benzene nucleus A may be substituted as described above, and which in the radical of the coupling component K contains in at least one ortho or para position to X a free hydrogen atom, with formaldehyde and ammonia or a primary or secondary aliphatic, cycloaliphatic, aromatic or heterocyclic amine or a salt thereof, and treating the thus obtained compounds of the general Formula 3 in which K, X, R, and R are defined as above and the benzene nucleus A may be substituted as described above, with an alkylating agent.

Preferred dyestuffs are the water-soluble cationic azodyestuffs of the formula wherein Y is a hydrogen, lower alkyl or phenylazo group, X is a hydroxyl or amino group and is in a position other than metato the azo group, X is a hydrogen, hydroxyl,

amino or lower alkyl group, R and R are each a hydrogen, lower alkyl, cycloalkyl, benzyl, phenyl, and together with the quaternary nitrogen atom, piperidyl or morpholinyl group, R is a lower alkyl group, and Z is an anion.

The substituent X in the above general Formulae 1, 2 and 3 may have a double function inasmuch as it is a) the substituent of the coupling component which is necessary for the coupling with a diazonium salt and b) simultaneously the substituent which according to the present invention is necessary for the aminomethylation provided that after the coupling reaction at least one ortho or para position with regard to the substituent X is still unsubstituted.

Suitable coupling components are, for example, phenol, resorcin, hydroquinone, cresol, phenolhalides, nitrophenols, aniline, m-phenylenediamine, Z-methylaniline, anilinehalides, nitranilines, aminophenols, anisidine, phenetidine.

As amines may be used, for example, aliphatic amines, such as methylamine, ethylamine, propylamine, butylamine, dimethylamine, diethylamine, dipropylamine, dibutylamine or alkylamines containing hydroxyalkyl groups, such as diethanolamine, furthermore aromatic amines, such as aniline, aminobenzenes or naphthylamines being substituted by halogen atoms, alkyl or alkoxy groups, heterocyclic amines, such as piperidine or morpholine, or aralkylamines, such as benzylamine. Instead of the free amines there may also be used the salts, such, for example, as the hydrochlorides, sulfates or acetates.

The molar ratio of starting dyestuif component to amine is generally 1:1, however, the amine may also be used in excess.

The formaldehyde is suitably used in a molar ratio of 1:1 calculated on the amine, the application of an excess of formaldehyde or amine being possible, The formaldehyde can be used in different form, for example, in aqueous solution or in the form of a polymer, such as parafromaldehyde.

The reaction takes place at a temperature within the range of 70 C. and 150 C., preferably between about 100 C. and 140 C. The individual optimum temperature depends upon the reaction component used.

The reaction can be carried out in an aqueous medium or in an inert organic solvent, such, for example, as dimethyl formamide, ethylene glycol, diethylene glycol, diethylene glycol monoethyl ether, dioxane or tetrahydrofurane. When the reaction is carried out at elevated temperatures, it may be necessary, depending on the reactants or the reaction medium used, to Work under pressure in an autoclave.

The compound of general Formula 3 is isolated in such a manner that the reaction mixture is poured into water or a low molecular weight alcohol, preferably methanol, and the precipitated product is filtered off. The compounds of general Formula 3 thus obtained are soluble in dilute aqueous acid and can be used from an aqueous-acid solution or aqueous dispersion for dyeing synthetic fiber material of, for example, polyacrylonitn'le, polyvinylidene cyanide, polyamide, polyethylene terephthalate, cellulose acetate or cellulose triacetate.

The compounds of general Formula 3 thus obtained are quaternized in known manner by reacting them with alkyl halides, such as methyl iodide, dialkyl sulfates, such as dimethyl sulfate or diethyl sulfate or with paratoluenesulfonic acid alkyl esters, such as para-toluenesulfonic acid methyl ester. The cationic final products are generally obtained in a good to very good yield.

The cationic dyestuffs so obtained which correspond to the general Formula 1 are soluble in water and yield from an aqueous bath fast dyeings or prints on synthetic fiber materials, such, for example, as polyacrylonitrile, polyvinylidene cyanide, polyamide, polyethylene terephthalate, cellulose acetate or cellulose triacetate. Their very good fastness to light and washing on fiber material of polyacrylonitrile, their good fastness to thermofixa- 3 4 tion and good aflinity to polyethylene terephthalate fibers was obtained which from an aqueous dispersion or weakare of particular interest. ly acetic acid solution dyed polyacrylonitrile, polyvinyl- The following examples serve to illustrate the lrlVenidene cyanide and polyethylene terephthalate fibers orange tion but they are not intended to limit it thereto, the i Parts and Percentages belrlg y Welght unless ctherwlse 5 When the dyestuif obtained was quaternized with di- Statedmethyl sulfate according to Example 1, paragraph 2, 34

Ex m [2 1 parts of 4 amino azgbeflzene were dissolved in 100 parts of the water-soluble cationic dyestutf of the formula CHz-C H2 parts of dimethyl formamide and mixed with 7 parts were obtained. This dyestulf dyed fibers of polyacryloniof paraformaldehyde and 7 parts of piperidine. After 20 trile, polyvinylidene cyanide, polyamides or polyethylene heating for 4 hours at 120 C., the mixture was diluted terephthalate orange tints.

with 400 parts of water. The precipitated product was Example 3 filtered off, washed and dried. In order to purify the product, it was dissolved in little glacial acetic acid, diluted Parts of Y Y- 6 Parts of P with 500 parts of water, separated by filtration from a formaldehyde and 16 Parts of dimethylamirle hydrochlosmall quantity of undissolved matter, and the filtrated ride were heated for 8 hours at a temperature Within the clear solution was poured into an excess of dilute sodium range of m tO in 150 Parts cf'dimethyl carbonate solution. After filtration, washing and drying, fcrmamide- Th miXtur Was then diluted with water 20 parts of 5 (piperidino methyl) 4 aminoazobenzene to Obtain 750 P the Precipitated Product was filtered were obtained. From an aqueous weakly acetic acid solu- Washed and dried- There Was ebtairled the tion, this compound dyed fibers of polyacrylonitrile, polymerhylamirlo'methyl)-4-hYdrXYaZ0be11Zene which from vinylidene cyanide and aromatic polyesters orange yellow all aqueous acetic acid Solution y fabrics of P y V ti t n-itrile,- polyvinylidene cyanide, polyamide, polyethylene 10 parts f th o d d ib d above were di terephthalate or cellulose acetate yellow tints.

solved in 50 parts of dirnethyl sulfate, and the solution By quaternization with dimethyl sulfate as described was heated for 2 hours at 100 C. After cooling, the III x mple 1, paragr ph 2, th re were Obtained 21 parts solution was diluted with 500 parts of ether. The precipof the water-soluble cationic dyestuff of the formula itated product was filtered oif, washed with ether and dried. The thus obtained quaternary salt of the formula -N=N- 0H 3 4O -N=NNHZ CH2-NCH3 ornosod- CH3CH3 6H g/ \CH CH OSO; CHa

" The dyestuff dyed fabrics of the afore-mentioned materials H CHTCH: likewise yellow tints. dyed fibers of polyacrylonitrile, polyvinylidene cyanide Example 4 and polyethylene terephthalate orange tints.

When using instead of piperidine equimolecular amounts Parts of 2,4-dihYdr0XY-E1Z0benZeHe Wer a e of morpholine, n-butylamine, benzylamine, aniline or N- for 4 hours at in an autoclave With 20 Parts of a methylaniline, aminomethyl azo-dyestutf compounds and 9 aqueous Solution of formaldehyde, P of p p salts thereof were obtained which corresponded to the dme and 100 Parts of Water- The reaetlOH lXtur Was compounds described above as regards their chemical and d; the Precipitated Pr Was filtered Washed i i l properties and dried. There was obtained the 3-(piperidino-methyl) 2,4-dihydroxyazobenzene which from an aqueous dispersion or aqueous acetic acid solution dyed fibers of polyacrylonitrile, polyvinylidene cyanide or polyethylene te- 315 parts of 4-(2-hydroxy-3-methyl-phenylazo)-azorephthalate yellow tints.

benzene were dissolved in 100 parts of ethyl diglycol and By quaternization in an excess of para-toluenesulfonic heated for 5 hours at 140 C. with 6 parts of paraformacid methyl ester at 100 C., 30 parts of the water-solualdehyde and 13 parts of piperidine. After diluting the ble cationic dyestufi of the formula Example 2 reaction mixture with water, filtering ofi? the product,

washing and drying, a dyestufi of the formula were obtained. This dyestuif dyed the fibers specified HO CH3 above likewise yellow tints.

I When using instead of 2,4-dihydroXy-azobenzene equi- N=NN=N I CHPCH, molecular amounts of Z-hydroxy-S-methyl-azobenzene, a yellow dyestuff was obtained which corresponded to the HPN product described above as regards the chemical and 0112-0 1 tinctorial properties.

benzene was obtained which was soluble in dilute acetic 15 acid and dyed fibers of polyacrylonitrile, polyvinylidene cyanide or polyesters yellow tints.

By quaternization with dimethyl sulfate as described in Example 1, paragraph 2, there were obtained 22 parts of the water-soluble cationic dyestuff of the formula on; CH2o2 From an aqueous solution, the dyestuif dyed the aforecited synthetic fibers yellow tints.

Example 6 23.6 parts of 4,6-diamino-3-methylazobenzene, 6 parts of paraforrnaldehyde, 10 parts of diethylamine and 100 parts of water were heated for 4 hours at 140 C. in an autoclave. precipitated product was filtered off, washed with water and dried. There was obtained the S-(diethylamino-methyl)-4,6-diamino-3-methyl-azobenzene which from an aqueous acetic acid solution dyed fibers of polyacrylonitrile, polyvinylidene cyanide and polyesters yellow tints.

The dry product obtained was introduced into 100 parts of diethyl sulfate and heated at 100 C. until a worked up specimen became water-soluble. The product was then diluted with acetone, filtered ofi? with suction, washed and dried. From an aqueous solution, the dyestufi obtained which corresponded to the formula H2N 2H5 021350 SO3 dyed the afore-mentioned fibers yellow tints.

An equal result was obtained when the quaternization was carried out with methylene chloride, methylene bromide or methylene iodide, superatmospheric pressure having been applied when methyl chloride or methyl bromide was used. In these cases, the cationic dyestuif contained an anion Cl Br or I We claim:

1. A water-soluble cationic azo-dyestutf of the formula The reaction mixture was then cooled, the 35 wherein Y is a hydrogen, lower alkyl or phenylazo group, X is a hydroxyl or amino group and is in a position other than metato the azo group, X is a hydrogen, hydroxyl, amino or lower alkyl group, R and R are each a hydrogen, lower alkyl, cycloalkyl, benzyl,,phenyl, and together with the quaternary nitrogen atom, piperidyl or morpholinyl group, R is a lower alkyl group, and Z is an anion.

2. The water-soluble cationic aZo-dyestuifs as claimed in claim 1, wherein Z represents a member of the group consisting of chloride, bromide, iodide, CH OSO 3. The water-soluble cationic azo-deystutf having the formula 4. The water-soluble cationic azo-dyestuff having the formula 5. The water-soluble cationic azo-dyestuff having the formula C Ha 6. The watersoluble cationic azo-dyestutf having the formula on3 CHE-CH2 7. The water-soluble cationic azo-dyestutf having the formula References Cited by the Examiner UNITED STATES PATENTS 2,234,036 3/1941 Zitschner et a1. 260152 XR 2,263,387 11/1941 Honk et al 260-4 52 XR 2,498,874 2/1950 Bock et a1 260-156 XR CHARLES B. PARKER, Primary Examiner.

FLOYD D. HIGEL, REYNOLD J. FINNEGAN,

Assistant Examiners. 

1. A WATER-SOLUBLE CATIONIC AZO-DYESTUFF OF THE FORMULA 